OFFSET
1,1
COMMENTS
See comments in A222975.
a(4) > 10^14, if it exists. - Amiram Eldar, Apr 05 2024
LINKS
Jan Munch Pedersen, Known Sociable Numbers of order four, Tables of Aliquot Cycles.
EXAMPLE
The first quadruple of this type is: 330003580, 363003980, 399304420, 440004764 that are respectively abundant, abundant, abundant, deficient.
CROSSREFS
KEYWORD
nonn,bref,more
AUTHOR
Michel Marcus, Mar 11 2013
STATUS
approved